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NCP5005
ANALOG SECTION (Typical values are referenced to T A = +25 ° C, Min & Max values are referenced ?25 ° C to +85 ° C ambient
temperature, unless otherwise noted.)
Rating
High Level Input Voltage
Low Level Input Voltage
EN Pull Down Resistor
Feedback Voltage Threshold
Output Current Stabilization Time Delay following a DC/DC Start?up,
@ V bat = 3.60 V, L = 22 m H, I out = 20 mA
Internal Switch ON Resistor @ Tamb = +25 ° C
Pin
4
4
3
1
1
Symbol
EN
R EN
FB
I outdly
QR DSON
Min
1.3
?
?
185
?
?
Typ
?
?
100
200
100
1.7
Max
?
0.4
?
225
?
?
Unit
V
V
k W
mV
m s
W
5. The overall tolerance depends upon the accuracy of the external resistor.
ESD PROTECTION
The NCP5005 includes silicon devices to protect the pins
against the ESD spikes voltages. To cope with the different
ESD voltages developed in the applications, the built?in
structures have been designed to handle " 2.0 kV in Human
Body Model (HBM) and " 200 V in Machine Model (MM)
on each pin.
DC/DC OPERATION
The DC/DC converter is designed to supply a constant
current to the external load, the circuit being powered from
a standard battery supply. Since the regulation is made by
POR
means of a current loop, the output voltage will varies
depending upon the dynamic impedance presented by the
load.
Considering high intensity LED, the output voltage can
range from a low 6.40 V (two LED in series biased with a
low current), up to 21 V, the voltage compliance the chip
can sustain continuously.
The basic DC/DC structure is depicted in Figure 3. With
a 28 V maximum rating voltage capability, the power
device can accommodate high voltage source without any
leakage current downgrading.
V bat
L1
22 m H
Vd sense
1
D1
TIME_OUT
Q1
Vds
LOGIC
CONTROL
ZERO_CROSSING
RESET
+
Vd sense
R1
GND
GND
?
V(Ipeak)
?
+
C2
3
R2
xR
Vs
Vref
GND
Figure 3. Basic DC/DC Converter Structure
http://onsemi.com
5
GND
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